Spatial coordinates and spatial database

does anybody know how to record spatial coordinates in the oracle database express edition and how to add the map viewer extensions to express edition

The Oracle feature you want to use is Oracle Locator - it is a cut down version of the full Spatial feature which is an added cost add-in to the Enterprise Edition.
As a first step read the Express documents - look for Locator in the master index - it will point you to the 2 day Locator developer book for Express.
So much for database side of things.
Mapviewer is a 10g Application Server tool - I am not expert in this but I think you do need 10gAS in the stack to serve up maps even if the data is hosted on XE
Another option to consider is the use of technologies such as Google Maps to serve the mapping overlayed with your data - examples exist on OTN to give a start

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    4 ETW000                                                                           32161  0.032658
    4 ETW000  [dev trc     ,00000]  Library '/usr/sap/PC1/SYS/exe/run/dboraslib.so' loaded
    4 ETW000                                                                              39  0.032697
    4 ETW000  [dev trc     ,00000]  function DbSlExpFuns loaded from library
    /usr/sap/PC1/SYS/exe/run/dboraslib.so
    4 ETW000                                                                             111  0.032808
    4 ETW000  [dev trc     ,00000]  Version of '/usr/sap/PC1/SYS/exe/run/dboraslib.so' is "700.08",
    patchlevel (0.25)
    4 ETW000                                                                             265  0.033073
    4 ETW000  [dev trc     ,00000]  function dsql_db_init loaded from library
    /usr/sap/PC1/SYS/exe/run/dboraslib.so
    4 ETW000                                                                              41  0.033114
    4 ETW000  [dev trc     ,00000]  function dbdd_exp_funs loaded from library
    /usr/sap/PC1/SYS/exe/run/dboraslib.so
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    4 ETW000                                                                              31  0.033404
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    4 ETW000                                                                              37  0.033441
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    4 ETW000                                                                              57  0.069798
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    4 ETW000  [dev trc     ,00000]  Nls CharacterSet                 NationalCharSet              C     
    EnvHp      ErrHp ErrHpBatch
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    4 ETW000  [dev trc     ,00000]    0 UTF8                                                      0
    0x6000000001052910 0x600000000105a3c0 0x600000000106ab38
    4 ETW000                                                                              58  0.069997
    4 ETW000  [dev trc     ,00000]  Allocating service context handle for con_hdl=0       40  0.070037
    4 ETW000  [dev trc     ,00000]  Allocating server context handle                      27  0.070064
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    4 ETW000  [dev trc     ,00000]         BEGIN DBMS_APPLICATION_INFO.SET_CLIENT_INFO(:A0); END;       
    4 ETW000                                                                              35  0.140797
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    4 ETW000  [dev trc     ,00000]         SELECT USERID, PASSWD FROM SAPUSER WHERE USERID IN (:A0, :A1)
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    4 ETW000  [dev trc     ,00000]  Got SAPSR3's password from OPS$-user                 728  0.143611
    4 ETW000  [dev trc     ,00000]  Disconnecting from connection 0 ...                   38  0.143649
    4 ETW000  [dev trc     ,00000]  Rolling back transaction ...                          31  0.143680
    4 ETW000  [dev trc     ,00000]  Closing user session
    (con_hdl=0,svchp=0x600000000106aa68,usrhp=0x60000000010fc940)
    4 ETW000                                                                             210  0.143890
    4 ETW000  [dev trc     ,00000]  Now I'm disconnected from ORACLE                     721  0.144611
    4 ETW000  [dev trc     ,00000]  Connecting as SAPSR3/<pwd>@PC1 on connection 0 (nls_hdl 0) ... (dbsl
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    4 ETW000                                                                              40  0.144651
    4 ETW000  [dev trc     ,00000]  Nls CharacterSet                 NationalCharSet              C     
    EnvHp      ErrHp ErrHpBatch
    4 ETW000                                                                              37  0.144688
    4 ETW000  [dev trc     ,00000]    0 UTF8                                                      0
    0x6000000001052910 0x600000000105a3c0 0x600000000106ab38
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    4 ETW000  [dev trc     ,00000]  Assigning username to user session: con_hdl=0,
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    4 ETW000  [dev trc     ,00000]  Connected to session 297.                            350  0.150293
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